What is the deadline for processing HBL amendments? Can amendments be filed at both the origin and destination points?

What is the deadline for processing HBL amendments? Can amendments be filed at both the origin and destination points?

For all house bill submissions, freight forwarders can submit pre-arrival changes (until the CBSA has received the conveyance arrival certification message upon arrival for non-highway modes and arrived by the Canada Border Services Officer (BSO) in highway mode) to the conveyance and goods at FPOA. Post-arrival, the freight forwarder must use the amendment transaction to transmit any subsequent changes.